丛枝菌根真菌接种对白车轴草耐盐性的影响

丛枝菌根真菌(AMF)可与植物共生形成复杂的菌丝网络，影响植物生长及抗逆能力。目前关于AMF对白车轴草耐盐性的影响尚存争议，本研究采用盆栽试验，研究在盐胁迫条件下(NaCl浓度为150 mmol·L^-1)，接种AMF对拉丁诺白车轴草耐盐性的影响。结果表明，在盐胁迫条件下，与对照相比，白车轴草的生长与生理指标均受到抑制。盐胁迫下接种AMF后，白车轴草株高、干重、PSⅡ最大光能转换效率和相对含水量均有增加，丙二醛(MDA)含量以及相对电导率有所降低，渗透调节物质均有提高，其中可溶性糖(SS)和游离脯氨酸(Pro)含量分别提高了32.03%和9.42%。说明盐胁迫抑制白车轴草的生长，接种AMF增强了白车轴草抗逆适应能力，促进白车轴草的生长，增加渗透调节物质含量，提高白车轴草耐盐胁迫的能力。

Effect of arbuscular mycorrhizal fungi on the salt tolerance of Trifolium repens

Arbuscular mycorrhizal fungi （AMF） enter into symbiotic relationships with plants by forming mycorrhizal networks， and thus play critical roles in plant growth and resilience to environmental stresses. At present， it is still debated whether AMF affect the salt tolerance of clover （Trifolium repens）. In this study， we explored the effect of AMF on T. repens plants under salt-stress conditions （NaCl at 150 mmol·L^-1）. It was found that， compared with a no-salt control， salt stress inhibited the growth and physiological indexes of T. repens. Under salt stress conditions， compared with uninoculated plants， those inoculated with AMF showed significantly increased plant height， dry weight， maximal photochemical efficiency of photosystem II， and relative water content， decreased malondialdehyde content and relative electric conductivity， and higher contents of soluble sugars and free proline （32.03% and 9.42% higher， respectively）. Our results demonstrate that salt stress inhibits the growth of T. repens， and that AMF improve the salt stress tolerance of T. repens by enhancing stress resistance and decreasing the malondialdehyde content and ion leakage （relative conductivity） under salt stress.